VTK/ITK use old versions of expat; should update

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

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As of 2007-08-09 the latest version of expat is 2.0.1. See http://expat.sourceforge.net/index.html

VTK and ITK both include 1.95.2 according to comments in expat.h. That version is from 2002 or earlier, it's not even listed on their "old news" page. :(

Despite the current version being 2.x and not 1.x, the code is of the same lineage and still the same API, see: http://expat.sourceforge.net/oldnews.html

Newer expat is likely to better support 64 bit machines, as they have become much more popular in recent years.